Purchasing power parity (PPP) is accounting for both absolute exchange rates and differential purchasing power across different countries

https://www.pewresearch.org/fact-tank/2015/07/09/how-america...

Global PPP uses USD purchasing power in the US as the baseline.

That's accounting for PPP adjustments.

Poverty line is a published official statement.

Percentile of world incomes, PPP adjusted, are easily found. Find and compare them.